JP2895653B2 - Load control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control device for controlling a plurality of loads such as an electric motor by a command signal from a central control device installed at a position apart from these loads.

[0003]

2. Description of the Related Art Conventionally, in this type of load control device, a central control device for controlling a plurality of loads is provided at a position distant from each load, and the operation of a corresponding load is performed in the vicinity of each load. 2. Description of the Related Art A plurality of on-site panels for performing a state switching operation and displaying an operation state are provided. Such a site panel is provided with, for example, a start operation switch, a stop operation switch, a shift volume, and the like for performing start and stop of a load, variable speed control of the load, and the like through a central control device. It is configured by providing display lamps for displaying such as based on data sent from the central control device.

[0004]

In the above-mentioned conventional configuration, there are disadvantages that the number of field panels corresponding to the loads is required, and the scale of the apparatus cannot be avoided, and the distance between the central control unit and each load is inevitable. In addition to the control wiring to be connected, there is a disadvantage in that a large number of wirings are required to transmit and receive signals between the central control device and each site panel. In order to deal with such a drawback, for example, a large number of field boards are replaced with a remote control device using a wireless communication device, and a radio signal is transmitted and received between the central control device and the remote control device. A configuration in which a communication device is provided can be considered. However, in such a configuration, when there are a large number of loads to be controlled, it is necessary to set a large number of channels corresponding to the number of loads as wireless channels with the remote control device, which is difficult to realize in practical use. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to realize a downsizing of the apparatus and a drastic reduction in the number of required wires, and to reliably perform a remote operation of a load. It is another object of the present invention to provide a load control device having an effect such as the following.

[Configuration of the Invention]

[0007]

In order to achieve the above object, the present invention provides a load control device wherein a plurality of loads are remotely controlled by a central control device. Remote control device for generating an identification code signal and an operation signal including the identification code and transmitting the signal by a radio signal, and a relay transmission device for relaying transmission and reception of a radio signal between the remote control device and the central control device With the provision of, the central control unit, when the identification code signal is received via the relay transmission device, through the relay transmission device an answer back signal indicating the control state of the load corresponding to the identification code signal The signal is transmitted as a radio signal, and when the operation signal is subsequently received via the relay transmission device, the identification code included in the operation signal is used as the reception identification code. The remote control device is configured to execute load control based on the operation signal only when the signal matches the signal, and the remote control device includes a receiving unit capable of receiving the answerback signal and a display unit displaying the received content. It was done.

[0008]

When the load is controlled by the remote control device, first, the remote control device transmits an identification code signal assigned to the load to be controlled by a radio signal. Then, the central control device that has received the identification code signal via the relay transmission device transmits an answerback signal indicating the control state of the load corresponding to the identification code signal as a radio signal through the relay transmission device. Therefore, on the remote operation device side, the answerback signal is received by the receiving means, and the received content, that is, the control state of the load is displayed on the display means. Based on such a display, when an operation signal including the identification code is transmitted from the remote operation device by a radio signal, the central control device that has received the signal transmits the identification code included in the reception operation signal to the reception identification code signal. Only when the control signal matches, the load control based on the operation signal is executed.

In this case, it is only necessary to provide one remote control device and one relay transmission device in addition to the central control device.
It is possible to reduce the size of the device, and furthermore, it is only necessary to provide the wiring connecting the central control device and the relay transmission device in addition to the wiring connecting the central control device and the load. It will be greatly reduced.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a central control unit 1 is installed at a position distant from a plurality of motors 2 as loads, and is connected to each motor 2 via a main circuit bus 3. Although the remote control device 4 is illustrated larger in FIG. 2 than the motor 2 or the like, it is actually configured in a portable shape and has a function of transmitting and receiving a radio signal as described later. A relay transmission device 5 having a transmission function and a reception function of a radio signal as described later
Is installed near the installation location of the central control unit 1
Is connected via a transmission line 6, and is configured to relay transmission and reception of a radio signal between the remote control device 4 and the central control device 1.

In FIG. 1, which shows an electrical configuration, a central control unit 1 is mainly composed of a control circuit 7 comprising a microcomputer. In addition, an input / output circuit 8, a storage circuit 9, a data transmission circuit 10, a determination circuit 11.

The input / output circuit 8 includes a circuit breaker, an electromagnetic contactor, a load current detector, a zero-phase current transformer (all not shown), etc., interposed in the main circuit bus 3, and a control circuit 7 The control circuit 7 controls the operation of the motor 2 in accordance with a command from the control circuit 7 and supplies information (load current value, zero-phase current value, etc.) indicating the operation state of the motor to the control circuit 7.

The storage circuit 9 stores the motor 2 to be controlled.
A control program and a protection characteristic for executing a control operation for executing a protection operation such as an overcurrent, an open phase, an undercurrent, a ground fault, and a control operation such as an instantaneous power failure restart and a timed restart. Function data is stored.

The data transmission circuit 10 transmits an answerback signal Sa output from the control circuit 7 as described later to the transmission line 6.
And an identification code signal Sb output from the relay transmission device 5 as described later and an operation signal Sc including the identification code are supplied to the control circuit 7 and the determination circuit 11.

When each of the identification code signal Sb and the operation signal Sc including the identification code is input, the determination circuit 11 outputs a determination signal Sd for specifying the motor 2 corresponding to the identification code, and outputs a determination signal Sd. Give to. The identification code is assigned to the plurality of motors 2 on a one-to-one basis.

The control circuit 7 controls the operation and protection of each motor 2 based on the control program and function data stored in the storage circuit 9, and performs the following control.

That is, the control circuit 7 includes the data transmission circuit 10
When the identification code signal Sb is input through the control circuit, the identification code is temporarily stored, and the control state of the motor 2 specified by the determination signal Sd from the determination circuit 11 (whether the motor 2 is in a state in which the motor 2 can be remotely operated). Is determined, and an answer back signal S indicating the control state is determined.
is output and given to the data transmission circuit 10. When the operation signal Sc is input through the data transmission circuit 10 after the output of the answer back signal Sa, the control circuit 7 determines that the identification code included in the operation signal Sc matches the identification code temporarily stored as described above. Only when this is done, the control of the motor 2 based on the operation signal Sc is executed.

On the other hand, the relay transmission device 5 includes a data transmission circuit 12, a transmission circuit 13, a reception circuit 14, and a data processing circuit 15. In this case, the data transmission circuit 10 is configured to exchange signals with the data transmission circuit 10 on the central control device 1 side via the transmission line 6, and the transmission circuit 13 and the reception circuit 14 4
The transmission and reception of a radio signal are performed between the communication device and the communication device.
Further, the data processing circuit 15 converts the answerback signal Sa received from the central control device 1 via the data transmission circuit 12 so that the answerback signal Sa can be transmitted as a radio signal via the transmission circuit 13, and transmits the answerback signal from the remote operation device 4 to the reception circuit. 1
4, the identification code signal Sb and the operation signal S
c is converted so that it can be transmitted through the data transmission circuit 12.

The remote control device 4 is mainly composed of a control circuit 16 composed of a microcomputer. In addition, the remote control device 4 includes a wireless communication circuit 17, a storage circuit 18, an operation device 19 (see FIG. 2), Display device 20 as display means
(See FIG. 2).

The radio communication circuit 17 transmits an identification code signal Sb from the control circuit 16 and an operation signal Sc including the identification code by a radio signal, and a transmission circuit 17a from the central control device 1 through the relay transmission device 5. Circuit 1 as a receiving means for receiving the answer back signal Sc
7b.

The storage circuit 18 stores a control program for the control circuit 16. The operating device 19 has a function for inputting an identification code of the motor 2 and a function for inputting the motor 2.
The control circuit 16 has a function for instructing the operation, stop, etc. of the control signal. The control circuit 16 responds to the operation of the operation device 19 by using the identification code signal Sb and the operation signal S including the identification code.
c, and outputs the signals Sb and Sc as radio signals through the wireless communication circuit 17.

As shown in FIG. 2, the display device 20 includes a panel unit 20a capable of displaying an identification code input by the operation device 19 and the contents of the answer back signal Sa, and a motor 2
And a display lamp 20b that indicates the operating state of the vehicle.

Next, the operation of the above configuration will be described while supplementing the function of the control circuit 16 in the remote controller 4.

When the motor 2 is controlled by the remote operation device 4, first, the operation device 19 of the remote operation device 4 is operated to input an identification code assigned to the motor 2 to be controlled. 16 transmits the identification code signal Sb as a radio signal through the wireless communication circuit 17. Then, the identification code signal Sb
Is received by the relay transmission device 5 and the transmission line 6
To the central controller 1 via

In this case, in the central control unit 1, the judgment circuit 11 outputs a judgment signal Sd for specifying the motor 2 corresponding to the input identification code signal Sb and gives it to the control circuit 7. , The control circuit 7 temporarily stores the input identification code, and the determination signal Sd
The control state of the motor 2 specified by (1) is determined (whether or not the motor 2 is in a state in which remote control is possible), an answerback signal Sa indicating the control state is output and given to the data transmission circuit 10. Specifically, for example, when the operation of the motor 2 specified by the determination signal Sd can be controlled, an answerback signal Sa indicating operation permission is output, and when the operation of the motor 2 cannot be controlled, the operation is disabled. An answer back signal Sa indicating that the state is enabled is output.

The answer back signal Sa is transmitted from the relay transmission device 5 as a radio signal.
In the remote control device 4 receiving this, the control circuit 1
6 displays on the display device 20 the control state of the motor 2 indicated by the answerback signal Sa.

With such a display, the operator can know whether or not the motor 2 to be controlled by the remote operation device 4 is in a state where the operation can be controlled. When the control device 16 is in a possible state, the control circuit 16 outputs an operation signal Sc including the identification code of the motor 2 to be controlled by operating the operation device 19. Then, the operation signal Sc is transmitted as a radio signal through the wireless communication circuit 17,
This is received by the relay transmission device 5 and given to the central control device 1. In this case, the control circuit 16 in the remote control device 4 invalidates the output operation of the control signal Sc by the control device 19 when receiving the answer back signal Sa indicating that the motor 2 is in an inoperable state. Configuration.

When the operation signal Sc is transmitted from the remote control device 4 as described above, the central control device 1
The control circuit 7 determines whether the identification code included in the received operation signal Sc matches the temporarily stored identification code as described above, and only when the identification codes match, the motor 2 based on the operation signal Sc. Execute the control of.

In short, according to the present embodiment, according to the transmission of the identification code signal Sb for specifying the control target motor 2 from the remote control device 4, the control state of the control target motor 2 is changed. This is displayed on the display device 20 on the side, and the remote control of the motor 2 can be performed based on such display. Therefore, many wireless channels are not required, and the remote control of the motor 2 can be performed reliably.

Also, in this case, since only one remote control device 4 and one relay transmission device 5 need to be provided in addition to the central control device 1, the size of the entire device can be reduced compared to the conventional configuration in which a plurality of field panels are provided. And the central control unit 1
In addition to the main circuit bus 3 connecting the motor and the motor 2, the transmission line 6 connecting the central control device 1 and the relay transmission device 5 only needs to be provided. Will decrease.

In the above-described embodiment, the configuration may be such that the rotation speed of the motor 2 can be controlled through the remote control device 4.

[0033]

According to the present invention, as described above, a remote control device for generating an identification code signal assigned to a plurality of loads on a one-to-one basis and an operation signal including the identification code and transmitting the generated operation signal by a radio signal. A central control device for controlling a plurality of loads, when receiving the identification code signal via the relay transmission device, an answerback signal indicating a control state of the load corresponding to the identification code signal. A radio signal transmitted through a relay transmission device, and when the operation signal is received through the relay transmission device thereafter, the operation signal is transmitted only when the identification code included in the operation signal matches the reception identification code signal. The remote control device is configured to display a receiving means capable of receiving the answerback signal and the content of the reception. Since the configuration includes a display means for performing remote control of a plurality of loads, it is only necessary to provide one remote control device and one relay transmission device, thereby reducing the size and necessity of the device. Thus, the number of wirings can be greatly reduced, and the remote operation of the load can be reliably performed.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view schematically showing an arrangement example.

[Explanation of symbols]

In the figure, 1 is a central control device, 2 is a motor (load), 3 is a main circuit bus, 4 is a remote control device, 5 is a relay transmission device, 6 is a transmission line, 7 is a control circuit, 8 is an input / output circuit, 11 is a determination circuit, 13 is a transmission circuit, 14 is a reception circuit, 16 is a control circuit, 17 is a wireless communication circuit, 17a is a transmission circuit, 17b is a reception circuit (reception means), 19 is an operation device, and 20 is a display device ( Display means).

Claims (1)

(57) [Claims] 1. A load control device for controlling a plurality of loads via a central control device installed at a position distant from the plurality of loads, comprising: an identification code signal assigned to the plurality of loads on a one-to-one basis; A remote control device that generates an operation signal including a code and transmits the control signal by a radio signal, and a relay transmission device provided to relay transmission and reception of a radio signal between the remote control device and the central control device. The central control unit transmits an answerback signal indicating a control state of a load corresponding to the identification code signal as a radio signal through the relay transmission device when the identification code signal is received via the relay transmission device. And when the operation signal is subsequently received via the relay transmission device and the identification code included in the operation signal matches the reception identification code signal. The remote control device is configured to include a receiving unit capable of receiving the answerback signal and a display unit for displaying the received content. A load control device characterized by the above-mentioned.